Control circuit for low noise frequency agile oscillator

Details Control circuit for low noise frequency agile oscillator Control circuit for low noise frequency agile oscillator

1982-04-23

1984-11-06

LaRoche, Eugene R.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Plural a.f.s. for a single oscillator

331 1R, 331 11, 331 15, 343 5AF, H03L 700

Patent

active

044814844

ABSTRACT:
In a control circuit for a voltage-controlled oscillator including the combination of: (a) a source of D.C. power, the voltage out of such source being adjustable in discrete steps to provide a coarse frequency control signal; (b) a control loop, responsive to the signal out of the voltage-controlled oscillator, to provide a fine frequency control signal; and (c) a summer to combine the coarse and fine frequency control signals into a single frequency control signal for the voltage-controlled oscillator, an improvement is shown wherein the control loop comprises an interferometer wherein noise extant on the signal out of the voltage-controlled oscillator is degenerated by dividing a portion of such signal into a reference path, a delayed path and a parallel path, the signals in the latter two paths being processed to produce an amplitude corrected signal for combination with the signal, shifted by 90.degree., in the reference path, finally to produce the fine frequency control signal.

REFERENCES:
patent: 3287656 (1966-11-01), Fleming
patent: 3992679 (1976-11-01), Isono
patent: 4032858 (1977-06-01), Hargis
patent: 4048580 (1977-09-01), Campbell et al.
patent: 4336505 (1982-06-01), Meyer

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